feat: lens effects tab, standalone motion effects, clip/asset rename, preview popout

- New Lens category in the assets panel: Blur, Motion Blur, Zoom In/Out,
  Pan x4, Shake, Pulse, Spin, Custom Zoom. EffectDefinition gains a
  category field; tabs with an empty category are hidden, and the
  properties-panel 'Open effects' button opens the first non-empty one.
- Motion effects work standalone: dropping them on the timeline creates
  an effect-track element that animates (scale/translate/rotate) every
  track below it, computed purely in the TS frame descriptor - no wasm
  changes, identical in preview and export. supportsStandalone removed.
- Motion Blur: directional gaussian smear (amount + angle) reusing the
  existing WGSL shader with arbitrary u_direction.
- Custom Zoom: start/end scale params (keyframable clip-level).
- MotionOffset gains optional rotate, accumulated clip-level and applied
  to standalone layer quads via rotationDegrees.
- Rename clips (timeline context menu) and media assets (media panel
  context menu) via a shared RenameDialog; asset rename persists through
  storageService with rollback on error.
- Preview pops out into a Document Picture-in-Picture window and docks
  back; button hidden where the API is unsupported.
- Export keeps running when the export popover is closed; only the
  explicit Cancel button aborts.
- Captions and Adjustment tabs removed from the assets panel.

1 files changed, 5 insertions, 2 deletions

diff --git a/apps/web/src/effects/components/effects-tab.tsx b/apps/web/src/effects/components/effects-tab.tsx
index 102d818a..91ad1f42 100644
--- a/apps/web/src/effects/components/effects-tab.tsx
+++ b/apps/web/src/effects/components/effects-tab.tsx
@@ -25,7 +25,10 @@ import {
 } from "@hugeicons/core-free-icons";
 import { cn } from "@/utils/ui";
 import { Separator } from "@/components/ui/separator";
-import { useAssetsPanelStore } from "@/components/editor/panels/assets/assets-panel-store";
+import {
+	getDefaultEffectsTab,
+	useAssetsPanelStore,
+} from "@/components/editor/panels/assets/assets-panel-store";
 
 export function StandaloneEffectTab({
 	element,
@@ -222,7 +225,7 @@ function EmptyView() {
 			<Button
 				variant="default"
 				size="sm"
-				onClick={() => setActiveTab("effects")}
+				onClick={() => setActiveTab(getDefaultEffectsTab())}
 			>
 				Open effects
 			</Button>